Threading device



April 22, 1924. 1,491,409v

vS. LEE V THREADING DEVICE Filed April 20. 1923 2 Sheets-Sheet 1 April22 1924.

' THHEADING DEVICE Filed April 20. 1923 2 Sheets-$heet 2'v y 1,491,409O. S. LEE l.

Fatented Apr. 22, 1924.

OTTAB S. LEE, OF CHICAGO, ILLINOIS, ASSIGNOR' TO THE NYEl TOOL & MACHINEWORKS, OF CHICAGO, ILLINOIS, A COVRPOBVATION OF ILLINOIS.

THREADING DEVICE.

Application led April 20, 1923. SerialANo. 633,420.

To all who/m, 'it may concern:

Be it known that I, OTTAR S. LEE, a citizen of the United States,residing at Chi-- cago, in the county of Cook and State of Illinois,have invented a new and useful Improvement in Threading Devices, ofwhich the following is a specification.

My invention relates, more particularly, to devices for forming threadson the ends of objects, more particularly pipes and rods; and my primaryobject is to provide a device which shall be adapted for threadinglarger pipes by employing thread-cutting chasers, and smaller pipes byemploying die blocks, thereby avoiding the necessity of providingseparate devices for utilizing the chasers and die blocks in the cuttingof larger and smaller objects, respectively.

Referring to the accompanying drawing:

Figure 1 is a face view of a structure embodying my invention. Figure 2is a section taken at the line 2-2 on Fig. 1 and viewed in the directionof the arrows, Figure 3 is a section taken at the line 3 on Fig. 1 andviewed in the direction of the arrows, and Fig. 4 an enlarged section ofthe body of the device with .the chasers positioned therein for use, thesection being taken through opposed chasers, with the chasers shown insection.

The particular construction illustrated comprises a ring-like member 3formed at one end with a peripheral fla-nge 4, its opposite end beingscrew-threaded, as represent-V ed at 5, to receive a ring 6 screwedthereon and forming, with the body of the ring 3 and liange 4y aperipheral annular groove 7 in which a ring 8 is rotatably confined, thering 3 being internally screw-threaded, as represented at 9. The ring 3is provided with a series of lugs 10 extending lengthwise of the deviceand provided in a circumferential series, these 'lugs terminating, attheirA outer ends, in a ring-shaped head 11, concentrically disposedrelative to the ring 3, the head 11 being provided at intervals withradially-extending set-,screws 12, located in threaded openings 13,1nthe ring 11, these set screws being provided for the purpose hereinafterset forth.

The device also comprises a head 14 comprising a tubular portion 1 5externallyl screw-threaded, as represented at 16, and screwing into thethreads 9 of the ring 3, the threads 9 and 16 forming a lead-screw forthe purpose hereinafter explained. The

outer end of the member 15 is provided with radially outward from theobject beingVv threaded thereby, asAV the threading opera# tionprogresses, the ring 8 is provided with a series of pins 21, four ofwhich are shown to. correspond with the number of "bosses 17, these.pins extending parallel with the axis of the device and extending intoopenings 22 in the bosses 17, in which they, have sliding fit. The pins21 extend into rthe grooves 19 and are each formed with an inclinedsurface, extending longitudinally thereof7 as shown of the surfaceA 23ofthe one of the pins shown in Fig. 3 and the two pins in Fig. 4, thesurfaces 23 diverging toward the right hand end of Figs. l2 and 4.

The innerl endsV o f the bosses -17 are sub-l stantially straight, thesestraight end surfaces, represented at V24, being preferably disposed atsubstantially right angles to each other, with the surfaces 24 of thediametricallyfopposed'bosses being parallel and` substantially equallyspaced apart, whereby the space bounded by the end surfaces 24 of thebosses 17 is such as to receive a die block such as is commonly used forforming threads on objects such as pipes or rods. A die block of thekind referred toV is represented at 25, it being formed of a bodyportion 426 of square form containing a central 4aperture 27 into whichthe cutter ends of the thread-cutting segments 28 secured iny thebody-portion 26, in radiating vposition thereon, extend.

The device also comprises `-releasable means for holding the die blockin the space bounded by the bosses 17, these means being of any suitableconstruction, those shown comprisinga plate 29 adapted to be laid acrossthe outer face of the Vdie block 25 and provided withrearwardly-projecting portions 30 and 31, the portion 30 having a engagethe rearfsurface of the one vot theY Webs 18 tliainetrically opposedtothe Wel) which is engaged oy the flange 32,V the portion of the plate29 Where it overlaps the lolocl; 25 loeing apertured as represented iFor the threading or" objects, such as pipes or rods, from say of oneinch diameter upwards, the die liloclr clamping ineans, and also the diehlocl; Y25, would he reinoved from the position shown in Figs. l and v2,and the chasers 100, such as are coinz'nonly employed in die stocks, andot a length and torni suitable for operating on the particular diameterof object to he threaded, inserted into the grooves. 19. The operatorthen selects a bushing of an internal diaineter sulostantiallj-,fv thesaine as the external diameter or the object to he threaded, and ins rtsthis bushing into the opening in the ring-shaped ineinher ll, the Ytorniohushing being sulostan tially that shown at 35 in Figs. 2 and e, 'theopening through this 1oushing 1seing represented at 36. rlhe de- 1ice isthen slipped over the endy of the pipev to be threaded, to cause thechasers 100 in the grooves 19 to entend adjacent the eX- treinity of thepipe et which the threads are to he produced, the bushing surroundingthe pipe, and the operator then tightens up the set screws l2, whichextend through openings 3? Vin the bushing, 'to set there rigidlyagainst the ohject to he threaded, rigidly securing the ring 3 againstrotation on the pipe. rl`he operator rthen rotates the nieniher lecarrying the chasers, handles 38 inserted into socket inernhers 39torined as part o'tvtwo of the bosses facilitai'ing rotation oi theinenieer le, the teeth ot the chasers cutting into the pipe to hethreaded. rlhe threaded connection-between 'Y the part l5 and the ring 3operates, when the inernher le is rotated in clockwise direction inllig. l, to cause the niemher l, with the chasers 100,Y to'rnove to theright in Figs. Qand l and consequently lengthchasers to cut a thread onthe pipe corresponding With the thread 16. As the memher le nieves tothe right in Figs. 2 and fl, :is stated, the pins 2l being held by therotatable ring 8, against lengthwise movenient, the chasers 100 are, 'hyreason of the inclined surfaces 23 ot these pins and against which theouter ends of the chasers e0 hear, permitted to inove radially outwardsufciently to eect the tapering of the thread produced on the object, asWill he Well understood in the art.

When it is desired to thread an object of smaller diameter the chasersare removed ise of the pipe, thus serving to cause the i l?) and a diehloolr 25, hrea-ding ol'v an ologect of to he threaded, is app. ce theposition shown in -hete plained, f with s' he die hloclr s reo; e toinerme the positiond'e ol-fick et a ight Tle to the ovile, and t .ns

Y d to 'a stilooi thing of the `fed into ne hushing ai enough to gripthe object. y

bloc-lr 25, the .i vice is slipped over the end 'the object to hethreaded and the entire device rotated on thc pipe, the cutting segments28 producing the desired thread on the object, it being understood that`as 'these die blocks are cominonf/Y cromo-ed,

they operate to cut the thread on the object Without requiring anyadditional ineens for feeding it along the pipe, suoli ss the lead screwmeans J and lo and which is required in the cose of the use oi chasersAas cornnionly provided and hereinloeiore dcscilied. lt is desirahlethat when the diehlocl; 25 is in place and the plate 29 secured inclampg position, thelilocl; 25 may shift in a action crossii'ise of theaxis the device, in the event that the s ot die hloclfA is out oitalinenieiit with the axis oit the pipe. in order that the die hloclrmaj; aline with the pipe. this heineY preferably provided for his soproporlioning the parts or' the device that the in which the die hlocltis located is o?. slightly7 laW r diniensions than the die block, and topermit the hloclr to slip as statorl the distance troni he outerseating-'taces"oi the seating lugs i8@ to the outer faces et the bossesl7-is slightly greater th an the thickness of the die hloclr 25, and theplate 29 is provided of such shape and size that it will tit tlatwiseagainst the outer faces ot the bosses '17, as shown.

lt will be understood from the foregoing that instead of requiringseparate devices for receiving and holding chasers and die blocks,respectively, for the threading of larger and smaller pipes, onereceiving and holding device only is necessary, the Workmen usingchasers ordie blocks with the saine device, depending upon the size ,ofthe object to Vbe threaded.

lt may be stated, as regards the particular torni of means shown forholding the die hloclr 25 in place, that as these means are bodilyremovable, though not indispenpreviously the use oli the device with thedie LSU sable to the carrying out of my invention, the device isrendered entirely free o any parts the presence of which might beobjectionable when the device is being used with chasers in the grooves19.

Vhile I have illustrated and described a particular constructionconstituting an embodiment of my invention, I do not wish to beunderstood as intending to limit it thereto as the same may be variouslymodified and altered Without departing from the spirit of the invention.

TWhat I claim as new, and desire to secure bj: Letters Patent, is:

1. A thread-cuttingdevice comprising a member containing an opening andadapted to hold thread-cutting chasers in operative position at saidopening, those surfaces of the portions of said member at which saidchasers are held, and which are disposed about said opening, beingdisposed at substantially 90O to each other and in opposed relation,adapting said member to receive a die block within the space bounded bysaid port-ions, and means for releasably hold ing the die block in saidposition on said member.

2. A thread-cutting device comprising a member containing an opening andprovided with bosses radiating from said opening. said bosses beingadapted to hold thread-cutting chasers in operative position at saidopening, the inner end surfaces or said bosses being so disposed as toafford a spa-ce adapted to receive a die block which bears at its rearface aga-inst portions of said member between said bosses, and meansopposing the outer face of the die block for releasably holding thelatter in position on said member.

3. A thread-cutting device comprising a member containing an opening andadapted to hold thread-cutting chasers in operative position at saidopening, the portions of said member at which said chasers are heldbeing so disposed as to adapt them to receive into the spacetherebetween a die block. and means for releasably holding the die blockin said position'on said member, the parts' being so constructed andarranged that the die block may shift in a plane at an angle to the axisof the device,

4. A thread-cutting device comprising a member containing an opening andprovided with bosses radiating from said opening, said bosses beingadapted to hold thread-cutting chasers in operative position at saidopening, the inner end surfaces of said bosses being so disposed as toaord a space adapted to receive a die block which bears at itsrear faceagainst portions of said member between said bosses, the distance fromthe outer faces of said bosses to the portion of said member whichopposes the rear face of the die block being greater than thethicknessof the die block to permit the die block to aline with the axis of thepipe by shifting in a direction crosswise of the axis of the device anda plate on said member opposing the outer face of the die block andbearing against the outer facesoi':` said bosses, for releasably holdingthe die block in position on said member, said die block being shitablein a plane at an angle to the axis ot' the device.

A thread-cutting device comprising a member containing an opening andadapted to hold thread-cutting chasers in operative position at s aidopening, the portions of said member at which said chasers are heldbeing so disposed as to adapt them to re-k ceive in the spacetherebetween a die-block, and means for releasably ho-lding thedieblock, in said position on said member comprising a clamping plateextending across the outer face of the die-block and provided Y withrearwardly-projecting portions one of which is equipped with a flangeadapted to overlap the rear face of said member and the other beingprovided with a screw adaptcd to engage the rear face of said member ata point opposite to said overlapping flange, whereby to releasably holdsaid die-block inplace. Y Y

oTTAR s. LEE.

